feat: add gno.land/pkg/gnoclient (Gno.land Go client) #3092

Job	Run time
build (1.20.x, GOARCH=amd64 GOOS=linux, gno)	23s
build (1.20.x, GOARCH=wasm GOOS=js, gno)	30s
test (1.20.x, _test.cmd)	1m 4s
build (1.21.x, GOARCH=amd64 GOOS=linux, gno)	26s
test (1.20.x, _test.pkg)	37s
build (1.21.x, GOARCH=wasm GOOS=js, gno)	24s
test (1.20.x, _test.gnolang.native)	21s
test (1.20.x, _test.gnolang.stdlibs)	46s
test (1.20.x, _test.gnolang.realm)	35s
test (1.20.x, _test.gnolang.pkg0)	1m 33s
test (1.20.x, _test.gnolang.pkg1)	6m 27s
test (1.20.x, _test.gnolang.pkg2)	4m 9s
test (1.20.x, _test.gnolang.other)	21s
test (1.21.x, _test.cmd)	1m 8s
test (1.21.x, _test.pkg)	48s
test (1.21.x, _test.gnolang.native)	20s
test (1.21.x, _test.gnolang.stdlibs)	50s
test (1.21.x, _test.gnolang.realm)	35s
test (1.21.x, _test.gnolang.pkg0)	1m 32s
test (1.21.x, _test.gnolang.pkg1)	6m 1s
test (1.21.x, _test.gnolang.pkg2)	4m 2s
test (1.21.x, _test.gnolang.other)	23s
upload-coverage	11s
	33m 26s

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